Keyboard for type-writing machines.



I APPLICATION FILED MAR. 24, 19H.

Patented June 22, 1915.

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h $5M. QR. S m NW A. nu. Mm M\\\ s 1.; f w w x Eww k% v Q. km m INVENTUR 0. etrmanw 0. PETERMANN. KEYBOARD FOR TYPEWRITING MACHINES.

APPLICATION FILED MAIL24, 19H.

Patented Jane 22, 1915.

5 SHEETS-SHEET 2.

IIIIIIIIIIITII IMVEIIITUR efiQr/nann O. PETERMANN. KEYBOARD FOR TYPE WRITING MACHINES.

' APPLICATION FILED MAR. 24, I9I-I. 1,144,238..

Patented June 22, 1915.

5 SHEETS-SHEET 3- l/WENTOR Peermazbw/ Inn mlullllIllll lllllllll ruin);

0. PETERMANN.

KEYBOARD FOR TYPE WRITING MACHINES.

APPLICATION FILED MAR. 24. 1911;

1,144,238.. Patented June 22, 1915.

5 SHEETS-SHEET 4.

0. PETERMANN.

KEYBOARD FOR TYPE WRITING MACHINES. APPLICATION r1150 1111111124. 1911.

1,144,233. Patented June 22, 1915.

5 SHEETS-SHEET 5.

C) m, 11111111 1 E zzzzzz key-lever movements of OTTO PETERMANN, OF GROTON, NEW YORK,

ASSIGNOR TO CORONA TYPE-WRITER COMPANY,- INCURPORA'IED, A CORPORATION OF NEW YORK.

KEYBOARD FOR TYPE-WRITING MAGHIN'ES.

Specification of Letters Patent.

Patented June 22, 1915.

Application filed March 24, 1911. SerialHo. 616,708.

To all whom it may concern Be it known that I, OT'IoPETERMANN, a citizen of the Republic of Switzerland, and a resident of Groton, county of Tompkms, and State of New York, have invented certain new and useful Improvements in Keyboards for Type-Writing Machines, of which the following is a full, clear, and exact description.

This invention relates more particularly to visible or front strike typewriting machines in which the platen and carriage may be folded or shifted into compact relation to another part of the machine.

One of the principal objects of the invention is to provide simple and eficient means whereby the key-levers have a rocking mo- *Zwhich are so connected 'tion on a support or plate and are so connected to the type-bars that the latter have an accelerated movement while printing to adapt the type-bars to be'moved slowly at first and then have their speed materially increased as the type-heads move to the printing point; and at the same time provide a key-lever movement in which the extent and place of acceleration may be changed at will, thereby overcoming many of the obty ewritmachines as ordinarily chnstructeg. ther objects of the invention are to provide simple and eflicient means whereby the key-levers and type-bars may lie normally in close relation to each other so that the machine may be made very compact for transportation or for other provide simple and eflicient bearing means for the key-levers; to provide simple and efficient means whereby the friction due to the movement of the key-levers is materially reduced and in such a way as to afford a sensitive and light touch for the key-levers; and to provide effective means for guiding and holding the key-levers properly.

Another object of the invention. is to provide individual springs for the key-levers to move the keylevers in one direction that a very even tension of the springs may be secured during the entire movement of said key-levers. I

A further object of the invention is to Jections incident to such parts of in provide simple and efiicient means whereby the key-levers may have a portion thereof adjusted even after themachlne has been assembled in order that each key-lever may Fig. 2 is a sectional purposes; to

that the type-bars properly operate the universal bar, and also i to permit each key-lever to be adjusted to connect with and properly operate one of the type-bars. i I

A still further object of the invention is to provide key-levers which may be made of very light material and so supported that there is comparatively very little friction during the operation of the same; and to provide key-levers and movements therefor which may be readily made and assembled and in which the pairs or for other purposes.

With these and other'objects in View, the invention wi11 be hereinafter more particularly described with reference to the accompanying drawings, which form a part of this specification, and will then be pointed out in the claims at the end of the description.

In the drawings, Figure 1 is a vertical section, partly in elevation, of a machine showing one embodiment of my invention. plan view through the machine frame, showing how the key-levers may be mounted, a f artpf the machine being broken away. ig. 3 is a vertical section, showing the platen and one of the keylever movements removed from the machine and in its normal position. Fig. 4 is a view similar to Fig. 3, except that the key-lever has been operated to move the type-bar to printing position, and showing by diagram the relative movements of the key-lever finger part or key and the movement of the type-bar head. ig. 5 is a fra entary vertical section taken on the line of Fig. 1, showing the construction ofthe guiding means for the key-levers and the shapeof the body of, the key-levers for the purpose of reducing friction. Fig. 6 isa longitudinal sectionthrough a machine similar to Fig.

'1, showing a somewhat different means for 'vingtension to the ke -levers. Fig. 7 is a agmentary sectional v1 ew taken on the line VI -VII of Fig; 6. Fig. 8 is a sectional plan viewthrough the frame of the machine showing the means for mounting the keylevers and mechanism shown in Fig. 6. Fig. 9 shows how the key-levers may be constructed and connected to the type-bars so will be operated with a pulling action; and Fig. 10 1s a view similar to Fig. 9 showing othermeansfor connect-- ing the key-levers to the type-bars for imparting a printing movement thereto.

While I show and 'shall describe the invention as applied particularly to aform of machine in which the carriage and platen are foldable over the keyboard or, forward thereof, it will be understood that the keyboard and key-lever movement or movements may be employed in connection with various forms of ty ewriting machines.

The frame 10 'may be provided with a vertically movable support 11 to which a bed 12 is held. A carriage 13 is adapted to move along the bed 12, and mounted in the carriage 13 is a suitable platen 14. The support 11 may be separable and pivoted together, as at 15, so that the platen and earriage may be folded forward to invert the carriage, and to cause the machine to be made more compact for trans ortation or for other purposes. The rear ar or plate 16 of-the machine frame has a number of brackets 17 secured thereto or other'means in which the type-bars 18 arepivotally held. These type-bars are pivoted at 19 to thebrackets 17, and at the forward and outer ends have type-heads 20 on which are a plurality of characters 21 representing the upper case, lower case and figures as is common in machines of this character, the said type-bars resting at their outer ends on a plate or support 21 when in their normal position. The parts thus far described may be of the usual or of any preferred construction.

A hearing plate, support or member 22 extends transversely of the machine. This plate or member may be substantially rectangular in form and has a wide or extended bearing surface 23, and may have pendent flanges 24 and 25 at its front and rear side edges, and flanges 26 at its ends. The flanges 26 of the plate 22 are secured to brackets or plates 27v and 28, and said brackets are fastened to the sides of the machine by screws or in any other preferred manner, though it will be understood that the bearing plate may be extended and fastened direct to the machine frame and the brackets 27 and 28 dispensed with. The plate 22 forms a support for a plurality of key-levers 29. These key-levers may be made of sheet steel and may be arranged in banks or groups. As shown, there are three groups though this number may vary at will, the purpose being to provide what is known as a universal keyboard. Each key-lever has a curved body portion 30, though only its lower edge 31 may be curved, and each key-lever stands on edge and has said edge resting directly upon the surface 23 of the plate 22. Each key-lever has its outer end provided with a key or finger portion 32-, and its inner end bent or formed so as to extend downward, as at 33, and said downward portion is provided with an ear or part 34. This car 34 is provided with an aperture and is connected by a link 35 to its cooperating type-bar 18, the said link connecting to the said type-bar at 36 adjacent to the t pe-bar pivot 19, so that a comparatively sight movement of the key-lever and link will force the type-bar head from its normal position to the printing 1point, as shown best in Fig. 4. The

evers are each provided with a projecting part 37 which may be curved and said part is adapted to fit more or less neatly, though free to move in an aperture or opening in the bearing plate 22., There are three sets of openings corresponding to the groups or banks of key-levers, in order that the leverage of the key-levers may be substantially the same, and in'order that the distance of the finger portions of the key-levers from said openings shall substantially correspond. The group or bank ofkey-levers 38 have their projections 37 entering openings 40 in the plate or member 22; the group of key-levers 41 have their parts 37 enterin openings 42, and the group or bank 0 key-levers 43 have their parts 37 entering openings 44. It will be seen that as the ke -levers are operated, the parts 37 will gui e and limit the inward movement of the key-levers, and owing to the curved lower edge 31 of each key-lever, a rocking movement will be imparted thereto and this rocking movement will force the lower end or part 34" of each key-lever upward and through the link 35 will force the type-bar head to printing position. By this means a very simple action is given to the key-lever which ermits the key-lever to be readily placed 1n position, and owing to the curvature of the edge, the friction between each-key-lever and the bearing surface of the plate 22 will be very small, and at the same time a much more effective movement to each key-lever is secured than would be obtained by pivoting the keylevers in the usual way.

The action of the lower edge of the keylevers with respect to the plane bearing surface 23 of the plate 22, has a further advantage in addition to reducing friction and said edge may be .utilized to accelerate the movement of the type-bar head while being forced to printing position. As shown in makin a sensitive and light touch, in that the diagram of Fig. 4, the finger portion or key 32 is indicated in four difierent equal movements and the corresponding movements of the type-heads are indicated by similar numbers 0, 1, 2 and 3, thus showing head is smallest at its initial movement and increasesso that the distance beyond 3 ,or the last part of the movement of each typebar is considerably longer than ,the initial movement which is comparatively slow. If the type-bars did not have an accelerated that the extent of movement of the type-bar a two-arm lever. That is,

movement, each type-bar would move equal Y distances as indicated bya, 12,0 and d, which of the key-lever maybe such as-toreVerse the direction of acceleration if" desired, so

that the movement will be slower at the printing point than during theinitial movement from normal position. The rawings show the bearing orsupport as straight and the bearing edge of the keylevers as curved, but it will be understood that both the support and the key-levers may be curved, or either of them, it being intended that a rocking action be secured by the key-levers.

It will be evident that each key-lever by reason of its direct bearing on the plate 22 and by reason of its shiftable fulcrum provides changeable lever arms each lever is supported intermediate its ends and between the key by which each lever is depressed and the end connected with the type-bar and the fulcrumshi-fts: from one end toward the other during the key-lever action. Each lever therefore comprises essentially a load arm and a power arm, the former or load arm being at the end between the fulcrum whatever its position may be and the end connected withthe type-bar, and the latter or power arm of the key-lever being between. the fulcrum wherever it may belocated by reason of the changing-rocking connection with the plate 22 and the key 32. As constructed, and at the initial point of depression, the fulcrum of the key-lever is near the inner end of the key-lever adjacent to the link 35 which connects it to the type-bar and at this time the power arm greatly exceeds the length ofthe load arm so that at the initial point of depression the,

type-bar may be started printing position with and with little operator. As the depression continues, the fulcrum shifts from the rear of the keylever toward the forward part thereof so that at. the final part of the depression the length of the load arm of each key-lever exceeds that of the powerarm. The effect of this is that while not objectionable to the operator because the type-bar has been started gradually and with the greatest power of the lever at the start, the speed of the type-bar is accelerated so that at the end of the strokethe speed of the type block is much greater than at the initial partv of the depression of each key. By this arrangement all connections in the way of auxiliary or supplemental levers maybe dispensed withiand the connection between the typebar and the lever made direct.

on its movement to very little or no eflort which the body of and is in effect shock to the finger of the "point where the link spring is fastened to a To secure as little friction as possible sidewise of the key-levers, and at the same time to support the same properly and to permit the key-levers to have tension applied thereto, I arrange a comb plate 45at the forward part ofthe machine, and a comb plate 46 at the rear part, both of which are secured by any suitable means to the flanges of the bearing plate. or member 22. The comb plate 45 has teeth forming slots in each key-lever moves vertically, and said teeth space the key-levers apart. Each key-lever may be provided with a corrugation or rib 47 which extends substantially throughout the entire length thereof and said rib conforms to the shape of the key-lever and is formed by pressing a part of the key-lever from the body portion to one side thereof. This rib serves not only to strengthen the key-lever so that much thinner steel or othermaterial'may be used, but the said ide three points of contact for the keylevers inthe guiding slots. The rib forms one point of contact on one side of the key lever body, and the key-lever has two points of contact on the depressed part on the opposite side thereof, so that a wide bearing is provided to prevent lateral rocking of the key-levers. The inner end of each key-lever body is guided in a comb portion 48 of the comb plate 46 and this comb portion is substantially identical with the comb of the plate 45, and serves to guide and hold the key-levers at the inner portion thereof, thus the key-levers are each properly guided and sustained so that the same may rock properly upon the supporting plate 22.

link 49 is ivotally held, to the inner portion of each ey-lever and each link engages an aperture in the end of a spring lever 50. here isa spring lever for each key-lever and each spring lever is guided in a slot forming a part of a comb portion 51 of the comb plate 46, this comb portion being substantially the same as the comb portion 48 of said plate The levers 50 have one end projecting outward and these ends are seated in cup-shaped depressions 52 in a transversely-extending angular plate 53 secured to the under side of the bearing plate 22. Each lever 50 has a relatively long spring 54 attached to an offset portion at one end-at a point adjacent to the 49 is secured, and said plate or bar 55. This plate 55 extends transversely of the machine and is Secured by screws or otherwise to the sides of the machine frame andhas a' plurality of sets of openings 56 whereby the ends of the springs may be detached from one set of openings and placed in another set to vary the tension of the springs. The pur: pose of not connecting the spring directly to the key-lever is to secure amore even tension spring through the spring lever and link key-lever has an ear or part 34 to which theserves also to prevent too much sliding friction between the key-levers and their support 22.

Each key-lever should be readily adjustable with respect to the universal bar and also with respect to its connection with its cooperating type-bar, and to secure this, each link 35 is held and a spaced ear, tongue or part 57 between which is an opening or space 57 The ear 34 may be bent relatively to the body portion to properly adjust the action of the type-bar and the ear or part 57 of each key-lever may be also bentwithout affecting the body of the key-lever in order that it may properly engage the universal bar 58, the. said universal bar being connected to operate the escapement mechanism in the usual or in any preferred way. By providing the ears 34: and 57 it will not be necessary to bend the body of the key-levers and by arranging the adjustment at the end as shown, the key-levers and type-bars may be adjusted to work properly after the machine has been assembled. This means also permits an adjustment to be secured whereby the escapement may be tripped during the last quarter of the printing movement and the carriage caused to move for letter spacing during a comparatively small part of the movement of the type-bar, thus tending to prevent the piling of letters on each other. I 4

While the tension of each spring 54 during the last part of the movement of the keylever is decreased, the resistance is increased by the universal'bar 58 and the spring or springs ordinarily used to keep said bar in the path of the key-levers, and this added resistance serves to insure a quick return movement of the type-bar.

The type-bars l8 and the key-levers 29 normally lie in a substantially horizontal plane in close relation in order to be more or less compact, and interposed between the key-levers and the type-bars is a plate or shield 58 one end of'which may be held to the support 21, and the other end fixed to or resting upon the upper edge of the comb plate 46 or any other suitable support. This plate or shield 58 may extend entirely across the machine over the key-levers, and

the purpose of the plate is to keep dust or particles from falling into the space occupied by the key-levers, and said plate also serves in a measure to deaden the sound due to the key-lever movement.

its pivot 77,

In Figs. 6 to 8, the construction is somewhat similar to that already described, except that the tension springs are differently arranged and the spring levers are dispensed with. In this construction also the bodies of the key-levers are shown as made plain without a corrugation, course, they may be made with a corrugation if desired. Each k'ey-lever is guided atits outer end by the forward comb plate 59 and at its inner end by the rear comb plate 60.-

Each key-lever has a downwardly-extending angular end 61 provided with an ear orpart 62 in which is an aperture, and connected to said ear 62 is a link 63' which is connected at its opposite end to one of the type-bars as already described. The key-levers each have though, of

a tension spring 64, one end of which is at- I tached to the inner end of the key-lever and its other end attached to a plate 65, the said 5;.

-crank lever 69 is pivoted at 70 and has a lug ortion 71 which is connected to a spring 2, the other end of said spring being fastened at any other desired point of the machine. Each bell-crank lever '69 extends upward through the bearing plate 22 and.

at the upper end thereof is connected by a link 73 to a part 74 of a type-bar 75. The type-bar 75 hasits type-head supported by a transverse plate or support 76 at one end, and each type-bar is pivoted at 77 to a part ofthe machine. Each link 73 connects with one.of the type-bars ata point adjacent to and each spring 72 may act upon the bell-crank lever 69 in substantially the same manner as the springs 54. As each key-lever is depressed, the inner end of the key-lever will be raised and through the link 68 vwill move the bellcrank lever on its pivot 70. This will force the link 73 forward which will move the type-bar on its pivot thus exerting a pulling action instead of a pushing action as in Figs. 1 to 8.

In Fig. 10, another construction is shown whereby the type-bars are forced to printing position with a pulling action instead of a pushingaction. Here each key-lever has substantially the same movement asalready described and each key-lever has its inner end connected to a vertically arranged spring 78 and at its extreme end is connected by a link 79 to one arm of a bellcrank lever 80. The bell-crank lever 80 is pivoted at 81 at the rear of the key-lever, and the arm .82 of each bell-crank lever is is connected, and as each key-lever is depressed, the bell-crank lever will. be rockedon its pivot and through the link 83 will 1iampart a printing movement to the type- In illustrating the invention, I show a special form of typewriter frame and also a special form of mounting for the carriage, but such features are not claimed herein as they form subject matter of other applications filed by me.

I showalso. a special form ofkey-lever having bendable portions one for engagement with the universal bar and the other as a means to connect the lever to a typebar, but such features are not claimed herein as they form part of my application, Serial No. 656,004, filed October 21', 191 1.

From the foregoing, it will be seen that an extended bearing surface is provided for each key-lever whereby the latter may rock on its support; that simple means is provided whereby a small amount of friction takes place so that an effective and easily movable lever movement is secured affording a light touch to the machine; that said key-lever movement is so constructed "thatjthe machine may be made very com pact; that the means described may be used in various kinds of machines; that simple means is provided whereby an accelerated movement may be imparted to the type.- head'; and that said means is simple in construction and may be readily made and assembled so that the cost of manufacture is materially reduced over that of the ordinary movement.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. In a typewriting machine, a pluralityof key-levers and a bearing for said: levers, each lever having a power armand a load arm, the power arm being considerablelonger than the load arm .of the lever, said bearing providing a shiftable fulcrum for the lever whereby the depression, ofa keylever causes the load arm to become longer than the power arm.

2. In a typewriting machine, supporting means, and key-levers each having a power and a load arm and su ported on said means between the ends. t ereof, saidsup porting means providing a fulcrum which shifts and makes the load arm of each lever greater than the power arm.

'3. In a typewritingmachine, a support, and a key lever engaging said support and r having a load* arm and apower arm, said support providing a shiftable fiulcrum for the lever whereby on the depression of the the power arm at the end of said depression.

4. In a typewriting machine, a stationary support, a plurality of depressible key-levers engaging said support, each lever having: a load arm and a power arm, said support providing a shiftablef-ulcrumfor said levers whereby on depression of each lever the load arm at one part of the depression is ofmuch. less length than the power arm andat another part of the depression exceeds greatly. that of the power arm, type-bars, and means 1ponnecting each lever to one of the typeare 5. In a typewriting machine, a stationary support, and a plurality of key-levers having a relatively changeable edgewise and continuous rocking connection directly with said support and intermediate the ends thereof and providing thereby a load arm and a power arm, the relative lengths of said arms changing materially during each depression to cause one arm first to exceed the other and the latter to exceed the former, a plurality of type-bars, and means connecting the type-bars tothe levers.

' 6'. In a typewriting machine, supporting means, key-l'eyers each having load and power arms and each having a horizontally arranged and extended curved: edge rocking directly on said 'supporting' means between the end-s thereof and having its fulcrum shifting; a substantial distance from one side of the center of rocking action to theother side to cause the load and power arms to alternately exceed each other in length, and type-bars operatively connected to said levers.

7; In a typewriting machine, a fiat supporting plate, key-levers each having a power arm and a lead arm and an extended curved edg: rocking directly on said: supporting p te between the ends thereof and having its fulcrum shifting a substantiahdistance from one. side of the center of rocking action to the other side to cause the power armthereof initially to 9X- ceed greatly the load' arm andthen the leadarm"to exceed greatly the power arm.

8. In a typewriti-ng-machme, the combination of a stationary support having a horizontally extended! fiatbearin-g surface, a plurality of key-levers each having a power arm and a load arm and each provided with a long continuous and gradually curved vbody and each having its body arranged each other in length, type-bars, and means Y for connecting each lever directly to one of the type-bars.

9. In a typewriting machine, a support, and'two arm key-levers each having a rocking action with said support and having one arm exceeding greatly the length of the other arm and the latter arm exceeding greatly the first mentioned arm during the same depression of said lever.

10. In a typewriting machine, a support,

a and a key-lever having its body portion ar- 7 of said lever.

12. In a typewriting machine, a support,

and a key-lever having an extended shifting bearing connection directly with said support between the ends thereof for the greater part of its length and having arms alternately exceeding each other in length during the same depression of said lever.

13. In a typewriting machine, a horizontally arranged plate-like support having an extended straight bearing surface, a plurality of key-levers located above said support and each having a long curved lower edge adapted to bear on said extended surface to provide a rocking connection therewith and to cause the power arm of the lever at the initial part of the depression to ex ceed greatly the load arm and at the end of the depression the load arm to exceed greatly the power arm, means for holding the key-levers edgewise and horizontally on said support, type-bars, and a connection between each lever and one of the typebars.

14. In a typewriting machine, a platelike support having an extended straight and horizontally arranged bearing surface, a plurality of key-levers located above the support and each having the edge of its body curved and adapted to bear directly on said extended surface and have a rocking connection therewith in a horizontal direction for the greater part of its length to cause the power arm first to exceed greatly the load arm and then the load arm exceed greatly the power arm, guiding means for the key-levers, type-bars, and a link connecting each lever and one of the type-bars.

1.5. In a typewriting machine, a plate-' like support having an extended straight bearing surface, a plurality of key-levers each having a curved lower horizontally arranged edge adapted to bear directly on said extended surface and have a shiftin bearing on said support betweenits en s and having its power arm initially greatly exceeding the load arm and then the load arm greatly exceeding the power arm during each depression, and means for holding the key-levers edgewise.

16. In a typewriting machine, a supporting member having a relatively wide and straight bearing surface and provided with a plurality of parallel arranged openings therethrough arranged in sets, a plurality of sets of key-levers each arranged edgewise and having a curved body portion w1th a projection at one edge thereof adapted to enter one of the openings in the supporting member, means for guiding the key-levers, type-bars, and means for connecting the key-levers to the type-bars.-

17. In a typewriting machine, a supporting member provided with a plurality of parallel arranged openings therethrough arranged in sets, and a plurality of sets of keylevers each having a projec ion at one edge thereof adapted to enter one of the openings in the supporting member, and having its body bearing directly on said supporting member.

18. In a typewriting machine, a supporting member having a relatively wide and straight bearing surface and provided with a plurality of parallel arranged openings therethrough arranged in sets, a plurality of sets of key-levers each being arranged edgewise and having a curved body portion with a projection at one edge thereof adapted to enter one of the openings in the supporting member, means for guiding the key-levers, type-bars, and means for connecting the key-levers to the type-bars.

19. In a typewriting machine, a support having openings, and a plurality of keylevers each provided with a projection entering one of said'openings and having its body'bearing on said support.

20. In a typewriting machine, the combination with a support, of key-levers arranged to rock edgewise between the ends thereof directly on said support, type-bars, connections between the key-levers and typebars, and comb plates for guiding each keylever at the inner and outer portions thereof.

21. In a typewriting machine, the com- .bination with a stationary support, of two comb plates secured to said support, and a plurality ofkey-levers arranged to rock edgewise between their ends directly on said support and guided in the comb plates. f

22. In a typewriting machine, the combiparallelarranged nation with a support, of'a plurality of keylevers arranged edgewise and held to rock on said supportand each having a bendable ear, means for guiding the 'key-levers, a

universal bar, a plurality of type-bars, a

menace connection between the ear of each key-lever and a type-bar, and a second car projecting from the end of each key-lever adapted to be bent to engage the universal bar for the purpose set forth.

23. In a typewriting machine, the combination with a su port, of a plurality of key-levers arranged edgewise and adapted to rock on said support, means for guiding the key-levers, a spring lever for each keylever, a fink connecting each spring lever at one end to one of the key-levers, a plate extending transversely. of themachine and having cup shaped depressions forming seats for one end of the springlevers, and a spring for each key-lever having one end attached to the spring lever and the other end to a part of the machine.

24. In a typewriting machine, the combination with a support, of a plurality of keylevers, a plurality of type-bars, and a spring for each key-lever so arranged that the tension of the spring will be increased and the leverage on the type-bar decreased as the lever load of the key-lever increases.

25. In a typewriting machine, the combination with a support, of a plurality of key levers, means for guiding the key-levers, a spring lever for each key-lever, a link connecting each spring lever at one end to one of the key-levers, and a spring for each keylever having one end attached to the spring lever and the other end to a part of the machine.

26. In a typewriting machine, the combination with a support, of a plurality of keylevers, means for guiding the key-levers, a spring lever connected to each key-lever, and a long spring extending under each keylever and connected to the spring lever.

27. In a typewriting machine, the combination with a support, of a plurality of ey-levers arran .ed edgewise to rock on said support, means or guiding the levers, typebars, connections between the levers and type-bars, spring levers, connections between the spring levers and the key-levers, and a spring for each spring lever having one end attached to the spring lever at a point adjacent to its connection with the key-lever and having its other end connected to apart of the machine. j

28. In a typewriting machine, the combination with a support, of a plurality of keylevers, type-bars, connections between the key-levers and type-bars, spring levers, connections between the spring levers and the key-lexers, and a spring for each spring lever.

29. In a, typewriting machine, the combination with a support, of a plurality of keylevers arranged to rock edgewise on said support, type-bars, connections between. the levers and type-bars, spring levers, connections between the spring levers and the keylevers, a bearing plate having cup-shaped depressions forming seats for one end of the sprin levers, a plate provided with holes at di erent distances from the spring levers, and a spring for each spring lever having one end attached to the key-lever at a point adjacent to its connection with the keylever and having its other end held in one of the holes of said latter plate.

30. In a typewriting machine, the combination of a support, a plurality of key-levers mounted on said support, a plurality of type-bars, means connecting each key-lever to one of the type-bars, and a dust plate extending transversely of the machine over the key-levers the greater part of the length thereof and under the type-bars when in a normal position.

31. In a typewriting machine, the combination of a support, a plurality of key-levers mounted to rock on said support, a plurality of type-bars, and a dust plate extending transversely of the machine over the keylevers for the greater part thereof. I

32. In a typewriting machine, the combination of a sup ort, a plurality of horizontally arranged ey-levers mounted on said support, a plurality of horizontally arranged type-bars, means connecting each key-lever to one of the type-bars, and a dust plate extending transversely of the machine over the key-levers and under the type-bars when in a normal position.

This specification signed and witnessed this 20th dayoflf March, A.'D. 1911.

OTTO PETERMANN.

of the length Witnesses: T. J. HOWELL,

FERN LESTER. 

